Abstract:
The hub assembly (16) of a disk cartridge (10) has an annular groove (18) formed in its bottom surface. The outer periphery of the annular groove undercuts the bottom surface of the hub assembly to form an annular lip (18b) around the outer periphery of the groove. A data storage device designed to receive the disk cartridge has a spindle motor (110) with at least one latch member (120) mounted on the upper portion of the motor via a flexure (122). The latch member on the spindle motor enters the annular groove on the hub assembly of the disk cartridge when the disk cartridge is inserted into the data storage device. When the spindle motor spins-up to its operating speed, the latch member moves radially outward on its flexure and engages the annular lip in the hub assembly, thereby preventing separation of the hub assembly from the spindle motor during rotation.
Abstract:
A one-piece magnet return path assembly (50) for a disk drive actuator comprises an upper plate (54), a lower plate (52) and a plurality of standoffs (56, 58, 60) extending between the upper and lower plates (54, 52) and establishing a predetermined spacing between the plates (54, 52). The upper and lower plates (54, 52) and the plurality of standoffs (56, 58, 60) are stamped from a single sheet of magnetically permeable material that is then bent at predetermined locations to form the completed one-piece magnet return path assembly (50).
Abstract:
A data storage device (40) for receiving a removable disk cartridge (10) includes a slidable platform (50), a retractable head (18, 19), and a head retractor (70). The slidable platform slides between a forward position where the disk cartridge is ejected and a rearward position where the disk cartridge is held for data accessing. Thus, when the disk cartridge is ejected, the slidable platform slides forward from the rearward position. As the platform travels forward, the head retractor is caused to drive the retractable heads to their safe park position so as to avoid any damage to the heads.
Abstract:
A disk cartridge (10) comprises a flexible disk (14) rotatably mounted in an outer casing (12). The outer casing (12) comprises upper and lower shells (22, 24) that mate to form the casing. Each of the upper and lower shells has an inner surface (22a, 24a) disposed in facing relation to a respective surface of the disk (14). A number of radially extending stabilizers (44, 46, 48, 50, 52, 54, 56, 58, 60, 62) are arranged on the inner surfaces of the upper and lower shells so as to induce a predetermined standing wave pattern in the flexible disk as the disk spins at high speeds, and to maintain the standing wave pattern as the recording heads (42a, 42b) of a disk drive move radially over the surface of the disk. Additionally, at least one pair of opposing projections (33, 35) are disposed on the inner surfaces of the upper and lower shells (22, 24) near a head access opening (30) in the front peripheral edge (20) of the cartridge (10). The opposing projections have a spacing, S, and serve to center the edge of the disk during head loading operations.
Abstract:
A data storage device (40) for receiving a removable disk cartridge (10) comprises first and second members (70, 72) movably mounted in the data storage device. Each movable member is adapted to perform a respective function within the disk drive. A first spring (90) is coupled to the first movable member (70) for biasing the first movable member in a first direction, and a second spring (92) is coupled to the second movable member (72) for biasing the second movable member in the same direction. A single electro-mechanical device (74) has a drive shaft (76) that engages the first and second movable members at different positions during its travel from an extended position to a retracted position. By applying different currents to the electro-mechanical device (74), the first and second movable members can be operated independently. The data storage device therefore can achieve two functions using only a single electro-mechanical device.
Abstract:
The presence of a disk cartridge (10) in a disk drive (40) is detected by obtaining a measure of the load on the spindle motor (82) of the disk drive and comparing that measure to a threshold value. The measure of load on the spindle motor may comprise (i) the time the spindle motor takes to spin-up to its full operating speed, (ii) the time the spindle motor takes to coast down to its operating speed from a first speed in excess of the operating speed, (iii) the voltage applied across the coils of the spindle motor, or (iv) the current drawn by the spindle motor.
Abstract:
An apparatus and method for etching a point on the surface of a magnetic medium to reduce the reflectivity of the point and for verifying that proper etching occured. A light source (40) provides a collimated incident beam of light (42). The incident beam is focused to a point on the medium (57) and a portion of the beam is reflected. The reflected beam (67) is separated from the incident beam and the intensity is compared to a threshold value and verification is indicated if the measured intensity exceeds the threshold value.
Abstract:
A disk drive (11) has a head cleaner (25) which cleans the heads (18, 19) each time the heads are moved from an operating position to a park position. The heads are slidably mounted to move into engagement with a disk (13) when a cartridge (10) containing the disk is inserted into the drive. When the heads are retracted to the park position, a wiper pad (27) is inserted into the gap between the magnetic heads. This removes unwanted particulate matter from the heads.
Abstract:
A magnetic head assembly (20) having a flat surface (26) for disposition adjacent to a recording medium (10) and a protrusion (27) in the range of about 1 to about 20 micro-inches on the flat surface (26) effects coupling of the head assembly (20) to the recording medium (10) and creates a constant contact zone, surrounding the read/write gap (28) of the head assembly (20), between the head assembly (20) and the record medium (10). The preferred range for the protusion (27) is about 6 to about 8 micro-inches and the area of the flat surface (26) is preferably in the range of about 3 to about 4 square millimeters.
Abstract:
A large capacity removable media drive (210) is integrated into a computer (200) as a floppy disk drive. The method and apparatus are suited to an environment in which the removable media disk drive is configured as the first fixed disk drive in the computer. Thus, the removable media drive is recognized by the BIOS as a fixed disk drive. A substitute master boot record is provided to the computer from the removable media drive in response to a request for the master boot record of the media. Control of the boot sequence is thereby gained. The substitute master boot record loads a boot program that alters the operating system to recognize the removable media drive as a floppy disk drive.